Crop plant anatomy by R K Maiti; et al

By R K Maiti; et al

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Tillers develop from the leaf axils at each unelongated node of the main shoot or other tillers during vegetative growth. Tillers should not be lodging; tiller stems with strong mechanical tissue (sclerenchyma) may impart non-lodging. Tiller stems may be screened microscopically for the variations in the intensity of sclerenchyma (Maiti, unpublished). Rice leaf is composed of the leaf sheath, the blade, the ligule and the auricles. The sheath is elongated, with a ribbon-shaped leaf base enrolling the culm.

The cells are usually round or oval. The cells are colourless and store starch. This region helps in lateral conduction of water and salts. After secondary growth the general cortex ruptures. (ii) The endodermis is very distinctive in roots. It is single layered, having compactly arranged barrel-shaped cells. Endodermal cells are characterized by the presences of Casparian strips or Casparian bands. Casparian bands are made of suberin. In transverse section, Casparian bands appear as lens-shaped thickening on the radial walls of the endodermis.

Monocot stem Generally monocots lack secondary growth. The stem is usually circular in outline in transverse section and is differentiated mainly into epidermis, cortex and stele (Fig. 16). 1. The epidermis is the outermost region of the stem, and is meant for protection. It is uniseriate, having a single layer of compactly arranged barrel-shaped living cells. The outer surface of the epidermis is covered by thick cuticle, which checks transpiration. Few stomata are present in the epidermis for the exchange of gases and transpiration.

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